﻿<p>This enumeration defines the
different types of space boundaries in terms of either being
inside the building or outside the building.</p>

<blockquote class="history">
HISTORY&nbsp; New enumeration in IFC2.0
</blockquote>

<blockquote class="change-ifc2x4">
IFC4 CHANGE&nbsp; Enumeration no longer applicable to <em>IfcSpace</em>. The following enumerators are added: EXTERNAL_EARTH, EXTERNAL_WATER, EXTERNAL_FIRE.
</blockquote>